WATER HEATER INCLUDING A DIP TUBE
A water heater includes a storage tank, a heat source for heating water stored in the storage tank, and a dip tube extending into the tank. The dip tube includes upper and lower ends, a restriction between the upper and lower ends so as to create back pressure in the dip tube above the restriction, the restriction positioned in an upper portion of the storage tank, a lower opening below the restriction for providing cold water to a lower portion of the storage tank, and an upper opening above the restriction for providing cold water to the upper portion of the storage tank due to the first restriction.
This application claims priority to co-pending U.S. Provisional Patent Application No. 61/322,387 filed on Apr. 9, 2010, the entire content of which is incorporated herein by reference.
BACKGROUND OF THE INVENTIONThe present invention relates to water heaters. More specifically, the present invention relates to dip tubes for water heaters. A dip tube is used to provide cold water to the storage tank of the water heater.
SUMMARY OF THE INVENTIONThe present invention provides, in one aspect, a water heater including a storage tank, a heat source for heating water stored in the storage tank, and a dip tube extending into the tank. The dip tube includes upper and lower ends, a restriction between the upper and lower ends so as to create back pressure in the dip tube above the restriction, the restriction positioned in an upper portion of the storage tank, a lower opening below the restriction for providing cold water to a lower portion of the storage tank, and an upper opening above the restriction for providing cold water to the upper portion of the storage tank due to the first restriction.
The present invention provides, in another aspect, a dip tube for use with a water heater including a storage tank with a lower portion and an upper portion and a heat source for heating water stored in the storage tank. The dip tube including an upper end, a lower end, a restriction between the upper and lower ends so as to create back pressure in the dip tube above the restriction, the restriction positioned in an upper portion of the storage tank, a lower opening below the restriction for providing cold water to the lower portion of the storage tank, and an upper opening above the restriction for providing cold water to the upper portion of the storage tank due to the first restriction.
Other features and aspects of the invention will become apparent by consideration of the following detailed description and accompanying drawings.
Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DETAILED DESCRIPTIONAn insert 205 is located inside the dip tube 170. The insert 205 is shown in detail in
The insert 205 is preferably made of cross-linked polyethylene (PEX) and has a tubular side wall 220 defining a central passageway 225. The outside of the side wall 220 has thereon a plurality of circumferential barbs 230 that provide a friction fit with the inside of the dip tube 170. Alternatively, the insert 205 can be secured within the dip tube 170 by a variety of appropriate methods, including a threaded connection, adhesive, or a friction fit without barbs, for example. The lower end of the insert 205 includes an annular hub 235 with a central opening 240. The hub 235 is connected to the side wall 220 by a plurality of spokes 245 extending downwardly and inwardly from the lower end of the side wall 220. Water flowing through the insert 205 can exit through the openings 247 between the spokes 245 or through the hub opening 240.
The insert 205 effectively reduces the inside diameter of the dip tube 170, creating above the restriction 210 a back pressure that forces cold water out of the dip tube 170 through the opening 215. The cold water exiting through the opening 215 into the upper portion 125 of the tank 110 helps to keep the temperature in the upper portion 125 within the preferred operating temperatures, thereby avoiding triggering the T&P valve 185 due to high temperature. In this way, the dip tube 170 addresses a problem where water flows of approximately one gallon per minute (or lower) can cause overheating at the upper portion 125 of the tank 100, which would trip the T&P valve 185 due to high temperature. Additionally, the dip tube 170 inhibits stacking within the tank 110, which helps improve the Energy Factor (EF) of the water heater 100 by preventing unnecessary cycling of the heat source 120.
As shown in
An alternative dip tube 370 is illustrated in
As shown in
As shown in
As shown in
The restrictions 410, 510, and 610 are integrally formed in the dip tube 370. Alternatively, the dip tube 370 can include more or fewer restrictions. The spacing between the restrictions can be constant or can vary. Alternatively, the restrictions 410, 510, and 610 can be created by multiple inserts 205 located in the dip tube 370. Preferably, the openings 415, 515, and 615 all have the same diameter. Alternatively, the openings 415 have a different diameter than the openings 515, which have a different diameter than the openings 615.
An alternative dip tube 670 is illustrated in
The upper tube 680 is formed by a tubular wall 725 and includes a lower end 730. The wall 725 has therein a hole or opening 735. Alternatively, multiple openings 735 are provided in the wall 725. The lower tube 685 is formed by a tubular wall 740 and includes an upper end 745.
The dip tube 670 is constructed by inserting the upper portion 700 of the insert 675 into the lower end 730 of the upper tube 680 and by inserting the lower portion 710 of the insert 675 into the upper end 745 of the lower tube 685 so that the insert 675 connects the upper tube 680 to the lower tube 685. The central portion 705 of the insert 675 effectively reduces the inside diameter of the dip tube 670, creating above the restriction 720 a back pressure that forces cold water out of the dip tube 670 through the opening 735. A dip tube with multiple restrictions similar to the dip tube 670 can be constructed by using additional inserts 675 and additional tubes so that when the additional inserts 675 and tubes are attached to one another, a back pressure is created above the restriction 720 of each insert that 675 forces cold water out of the dip tube through an opening 735 in the tube above that insert 675.
Various features of the invention are set forth in the following claims.
Claims
1. A water heater comprising:
- a storage tank;
- a heat source for heating water stored in the storage tank;
- a dip tube extending into the tank, the dip tube having upper and lower ends, a restriction between the upper and lower ends so as to create back pressure in the dip tube above the restriction, the restriction positioned in an upper portion of the storage tank, a lower opening below the restriction for providing cold water to a lower portion of the storage tank, and an upper opening above the restriction for providing cold water to the upper portion of the storage tank due to the restriction.
2. The water heater of claim 1, wherein the upper opening is one of a plurality of upper openings above the restriction and uniformly distributed around the circumference of the dip tube.
3. The water heater of claim 2, wherein the dip tube further includes a second restriction between the upper end and the lower end so as to create back pressure in the dip tube above the second restriction, and a plurality of second upper openings uniformly distributed around the circumference of the dip tube, the second upper openings positioned above the second restriction for providing water to the storage tank due to the second restriction.
4. The water heater of claim 3, wherein the upper openings each have a first diameter and the second upper openings each have a second diameter different than the first diameter.
5. The water heater of claim 3, wherein the dip tube further includes a longitudinal axis, and wherein center points of the first-mentioned upper openings define a first plane that is substantially perpendicular to the longitudinal axis and center points of the second upper openings define a second plane that is substantially perpendicular to the longitudinal axis.
6. The water heater of claim 5, wherein the first-mentioned upper openings each have a first diameter and the second upper openings each have a second diameter different than the first diameter.
7. The water heater of claim 5, wherein the second upper openings are offset from the first-mentioned upper openings.
8. The water heater of claim 7, wherein the first-mentioned upper openings each have a first diameter and the second upper openings each have a second diameter different than the first diameter.
9. The water heater of claim 3, wherein the dip tube further includes a third restriction between the upper end and the lower end so as to create back pressure in the dip tube above the third restriction and a plurality of third upper openings uniformly distributed around the circumference of the dip tube, the third upper openings positioned above the third restriction for providing water to the storage tank due to the third restriction.
10. The water heater of claim 9, wherein the first-mentioned upper openings each have a first diameter, the second upper openings each have a second diameter different than the first diameter, and the third upper openings each have a third diameter different than the first diameter and the second diameter.
11. The water heater of claim 9, wherein the dip tube further includes a longitudinal axis; and wherein center points of the first-mentioned upper openings define a first plane that is substantially perpendicular to the longitudinal axis, center points of the second upper openings define a second plane that is substantially perpendicular to the longitudinal axis, and center points of the third upper openings define a third plane that is substantially perpendicular to the longitudinal axis.
12. The water heater of claim 11, wherein the first-mentioned upper openings each have a first diameter, the second upper openings each have a second diameter different than the first diameter, and the third upper openings each have a third diameter different than the first diameter and the second diameter.
13. The water heater of claim 11, wherein the second upper openings are offset from the first-mentioned upper openings and the third upper openings are offset from the second upper openings.
14. The water heater of claim 1, wherein the restriction is formed as an insert that is positioned within the dip tube.
15. The water heater of claim 1, wherein the restriction is integrally formed with the dip tube.
16. The water heater of claim 1, wherein the dip tube further includes an insert, an upper tube, and a lower tube, the insert connecting the upper tube to the lower tube; wherein the restriction is formed in the insert; and wherein the upper opening is formed in the upper tube.
17. The water heater of claim 1, wherein the dip tube further includes a second restriction between the upper end and the lower end so as to create back pressure in the dip tube above the second restriction and a second upper opening above the second restriction for providing water to the storage tank due to the second restriction.
18. The water heater of claim 17, wherein the first-mentioned restriction and the second restriction are integrally formed with the dip tube.
19. The water heater of claim 17, wherein the dip tube further includes a third restriction between the upper end and the lower end so as to create back pressure in the dip tube above the third restriction, and a third upper opening above the third restriction for providing water to the storage tank due to the third restriction.
20. A dip tube for use with a water heater including a storage tank with a lower portion and an upper portion and a heat source for heating water stored in the storage tank, the dip tube comprising:
- an upper end;
- a lower end;
- a restriction between the upper and lower ends so as to create back pressure in the dip tube above the restriction, the restriction positioned in an upper portion of the storage tank;
- a lower opening below the restriction for providing cold water to the lower portion of the storage tank; and
- an upper opening above the restriction for providing cold water to the upper portion of the storage tank due to the first restriction.
Type: Application
Filed: Apr 7, 2011
Publication Date: Oct 13, 2011
Inventors: Timothy Mitchell Smith (Blountville, TN), J. Eric Arnold (Jonesborough, TN), Ramin K. Rahmani (Johnson City, TN), Mark Allan Murphy (Nashville, TN)
Application Number: 13/081,676
International Classification: F24H 9/02 (20060101);